/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.parquet.io;

import org.apache.parquet.column.impl.ColumnReadStoreImpl;
import org.apache.parquet.column.page.PageReadStore;
import org.apache.parquet.io.api.RecordMaterializer;
import org.apache.parquet.it.unimi.dsi.fastutil.ints.IntList;

import java.util.List;

import static org.apache.parquet.Preconditions.checkNotNull;

public class RecordReaderFactory {

    public static <T> RecordReader<T> getRecordReader(
        MessageColumnIO root,
        PageReadStore columns,
        RecordMaterializer<T> recordMaterializer,
        String createdBy,
        IntList rowIdList) {
      checkNotNull(root, "messageColumnIO");
      checkNotNull(columns, "columns");
      checkNotNull(recordMaterializer, "recordMaterializer");

      List<PrimitiveColumnIO> leaves = root.getLeaves();

      if (leaves.isEmpty()) {
        return new EmptyRecordReader<>(recordMaterializer);
      }

      return new PositionableRecordReaderImpl<>(
        root,
        recordMaterializer,
        new ColumnReadStoreImpl(columns,
          recordMaterializer.getRootConverter(),
          root.getType(),
          createdBy),
        columns.getRowCount(),
        rowIdList);
    }
}
